fix: only run az fnapp deploy on PR merged

Author: andhreljaKern

.github/workflows/az_fnapp_deploy.yml

@@ -8,7 +8,7 @@ jobs:
     name: "Azure: Build & Deploy Function App"
     runs-on: [self-hosted, "${{ github.event.pull_request.base.ref }}"]
     environment: ${{ github.event.pull_request.base.ref }}
-    if: ${{ vars.TF_DESTROY != '-destroy' }}
+    if: ${{ vars.TF_DESTROY != '-destroy' && github.event.pull_request.merged }}
     env:
       AZURE_FUNCTIONAPP_NAME: ${{ vars.AZURE_FUNCTIONAPP_NAME }}
       AZURE_FUNCTIONAPP_PACKAGE_PATH: ${{ vars.AZURE_FUNCTIONAPP_PACKAGE_PATH }}